Flywheel or flexplate...
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Cargo Master
Joined: May 2011
Posts: 2,388
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From: Northern California
Flywheel or flexplate...
I have been looking for a cheap used 57 tooth 50oz flywheel for my boat... Its running a 5.0L. Finding this isnt as easy as it should be; at least for a cheap ($20) one. I have been able to find quite a few flex plates though.
The primary functions the flywheel seems to perform are engine balance and the starter gear; a flex plate would do this as well. Is there a third dynamic purpose such a centrifical force or something the flywheel provides that a flex plate wouldnt?
If the responses here are inconclusive, I will simply bust the bank a little further open on this thing. I figure it had a flywheel to begin with for some reason on the old 28oz motor.
The primary functions the flywheel seems to perform are engine balance and the starter gear; a flex plate would do this as well. Is there a third dynamic purpose such a centrifical force or something the flywheel provides that a flex plate wouldnt?
If the responses here are inconclusive, I will simply bust the bank a little further open on this thing. I figure it had a flywheel to begin with for some reason on the old 28oz motor.
Lead Driver
Joined: Sep 2003
Posts: 7,017
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From: SoCal
They flywheel's primary purpose is to provide the rest of the rotating mass with more inertia to keep them rotating between the combustion strokes. The heavier flywheels will store more energy at a given speed, so if your intention is to side-stepping the clutch, it will transfer a little more energy to the transmission. On the other hand, a heavier flywheel will take more energy to spin up to speed.
All the other things that a flywheel is used for are secondary functions: counterbalancing the rest of the rotating assembly, friction surface for the clutch, pressure plate mount, teeth for the starter.
How do you usually couple the engine to the prop shaft on a boat?
All the other things that a flywheel is used for are secondary functions: counterbalancing the rest of the rotating assembly, friction surface for the clutch, pressure plate mount, teeth for the starter.
How do you usually couple the engine to the prop shaft on a boat?
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Cargo Master
Joined: May 2011
Posts: 2,388
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From: Northern California
And with an auto the torque converter assumes the inertia function... Thats cool. Learning something everyday...
The coupler do-dad in the pic below attaches behind the flywheel. Both attach to the crank with studs rather than bolts and some fancy nuts that hold them on.
The coupler do-dad in the pic below attaches behind the flywheel. Both attach to the crank with studs rather than bolts and some fancy nuts that hold them on.
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Cargo Master
Joined: May 2011
Posts: 2,388
Likes: 138
From: Northern California
I think I found one for $20 from a guy in Sacramento... He is going to send me a front and back picture to confirm... I will post as I am not so good at deciphering all the parts codes and stuff.
Hotshot
Joined: May 2003
Posts: 11,141
Likes: 25
From: south louisiana
I had an inboard/outboard with a Chevy V6, it had a flywheel. The only time I think it's inertial weight comes into play is when you slip the shift lever into gear. There's not a whole lot of shock for it to overcome though, seems a flexplate could work, but I could be wrong. With a boat, you just need a flywheel, it doesn't even have to be a good one, just the right one.
Lead Driver
Joined: Sep 2003
Posts: 7,017
Likes: 209
From: SoCal
If the coupler bolts directly to the crank shaft, then I think you should be able to use either a flywheel or a flex plate. The lighter flex plate without the TC will allow the engine to spin up faster.
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Cargo Master
Joined: May 2011
Posts: 2,388
Likes: 138
From: Northern California
I found a flywheel for $20... Still have to confirm its a 157 tooth 50oz. Assuming so I am going this way. Not interested in an experiment that migh result in pulling the engine again.
The engine is also governed to 4500rpm. Any faster and the outboard gets torn up. Point being is it will spin up fast enough with a flywheel but I get what your saying about less rotational weight.
The engine is also governed to 4500rpm. Any faster and the outboard gets torn up. Point being is it will spin up fast enough with a flywheel but I get what your saying about less rotational weight.
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